Description
A use-after-free vulnerability in the Linux kernel's fs/smb/client component can be exploited to achieve local privilege escalation.
In case of an error in smb3_fs_context_parse_param, ctx->password was freed but the field was not set to NULL which could lead to double free.
We recommend upgrading past commit e6e43b8aa7cd3c3af686caf0c2e11819a886d705.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Kernel | 0.0 – < 6.6 | 6.6 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.5.6-1 | — |
| Debian 13 | linux | 6.5.6-1 | — |
| Debian 12 | linux | 6.1.64-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi | 6.7.0-1001.1 | — |
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-aws-6.2 | 6.2.0-1016.16~22.04.1 | USN-6502-1 |
| Ubuntu 22.04 LTS | linux-aws-6.5 | 6.5.0-1010.10~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1054.62 | USN-6607-1 |
| Ubuntu 22.04 LTS | linux-azure-6.2 +1 | 6.2.0-1017.17~22.04.1 | USN-6502-4, USN-6502-1 |
| Ubuntu 22.04 LTS | linux-azure-6.5 | 6.5.0-1009.9~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1054.62.1 | USN-6607-1 |
| Ubuntu 22.04 LTS | linux-azure-fde-6.2 | 6.2.0-1017.17~22.04.1.1 | USN-6502-4 |
| Ubuntu 22.04 LTS | linux-gcp-6.2 | 6.2.0-1019.21~22.04.1 | USN-6502-4 |
| Ubuntu 22.04 LTS | linux-hwe-6.2 | 6.2.0-37.38~22.04.1 | USN-6502-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.2 | 6.2.0-1012.12 | USN-6502-3 |
| Ubuntu 22.04 LTS | linux-nvidia-6.5 | 6.5.0-1007.7 | — |
| Ubuntu 22.04 LTS | linux-oem-6.1 | 6.1.0-1025.25 | USN-6461-1 |
| Ubuntu 22.04 LTS | linux-oem-6.5 | 6.5.0-1008.8 | USN-6503-1 |
| Ubuntu 22.04 LTS | linux-riscv +13 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-starfive-6.2 | 6.2.0-1009.10~22.04.1 | USN-6520-1 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1054.62~20.04.1 | USN-6607-1 |
| Ubuntu 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1054.62~20.04.1.1 | USN-6607-1 |
| Ubuntu 20.04 LTS | linux-gke +26 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-azure-fips | No fix yet | — |
| Ubuntu Pro 22.04 LTS | linux | 5.15.0-94.104 | LSN-0100-1 |
| Ubuntu Pro 22.04 LTS | linux-aws | 5.15.0-1053.58 | LSN-0100-1 |
| Ubuntu Pro 22.04 LTS | linux-aws-6.2 | 6.2.0-1018.18~22.04.1 | LSN-0100-1 |
| Ubuntu Pro 22.04 LTS | linux-azure | 5.15.0-1056.64 | LSN-0100-1 |
| Ubuntu Pro 22.04 LTS | linux-azure-6.2 | 6.2.0-1019.19~22.04.1 | LSN-0100-1 |
| Ubuntu Pro 22.04 LTS | linux-gcp | 5.15.0-1051.59 | LSN-0100-1 |
| Ubuntu Pro 22.04 LTS | linux-gcp-6.2 | 6.2.0-1021.23~22.04.1 | LSN-0100-1 |
| Ubuntu Pro 22.04 LTS | linux-gke | 5.15.0-1050.55 | LSN-0100-1 |
| Ubuntu Pro 22.04 LTS | linux-hwe-6.2 | 6.2.0-37.38~22.04.1 | LSN-0100-1 |
| Ubuntu Pro 22.04 LTS | linux-ibm | 5.15.0-1046.49 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux | 5.4.0-170.188 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-aws | 5.4.0-1117.127 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-aws-5.15 | 5.15.0-1053.58~20.04.1 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-azure | 5.4.0-1122.129 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-gcp | 5.4.0-1121.130 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-gcp-5.15 | 5.15.0-1051.59~20.04.1 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-gke +1 | No fix yet | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-gkeop | 5.4.0-1084.88 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-94.104~20.04.1 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-ibm | 5.4.0-1064.69 | LSN-0100-1 |
| Ubuntu Pro 20.04 LTS | linux-ibm-5.15 | 5.15.0-1046.49~20.04.1 | LSN-0100-1 |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-221.232 | LSN-0100-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1164.177 | LSN-0100-1 |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1117.127~18.04.1 | LSN-0100-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-4.15 | 4.15.0-1173.188 | LSN-0100-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1122.129~18.04.1 | LSN-0100-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-4.15 | 4.15.0-1158.175 | LSN-0100-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1121.130~18.04.1 | LSN-0100-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-170.188~18.04.1 | LSN-0100-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-250.284 | LSN-0100-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1165.180 | LSN-0100-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1164.177~16.04.1 | LSN-0100-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1173.188~16.04.1 | LSN-0100-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1158.175~16.04.1 | LSN-0100-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-221.232~16.04.1 | LSN-0100-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-250.284~14.04.1 | LSN-0100-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bpftool | 7.2.0-362.13.1.el9_3 | RHSA-2023:7749 |
| RHEL 9 | kpatch-patch-5_14_0-362_8_1 | 1-1.el9_3 | RHSA-2023:7734 |
| RHEL 9 | rv +64 | 5.14.0-362.13.1.el9_3 | RHSA-2023:7749 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | kernel | 5.14.0-362.13.1.el9_3.cloud.0.3 | RXSA-2023:7749 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.31.1 | SUSE-SU-2023:4071-1 |
| SLES 15 SP5 | kernel-azure +2 | 5.14.21-150500.33.20.1 | SUSE-SU-2023:4058-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.31.1.150500.6.13.1 | SUSE-SU-2023:4071-1 |
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.92.1 | SUSE-SU-2023:4072-1 |
| SLES 15 SP4 | kernel-azure +2 | 5.14.21-150400.14.69.1 | SUSE-SU-2023:4057-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.92.1.150400.24.42.1 | SUSE-SU-2023:4072-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.5 | kernel-default | 5.14.21-150500.55.31.1 | SUSE-SU-2023:4071-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.31.1.150500.6.13.1 | SUSE-SU-2023:4071-1 |
| SLE Micro 5.5 | kernel-rt | 5.14.21-150500.13.21.1 | SUSE-SU-2023:4035-1 |
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.92.1 | SUSE-SU-2023:4072-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.92.1.150400.24.42.1 | SUSE-SU-2023:4072-1 |
| SLE Micro 5.4 | kernel-rt | 5.14.21-150400.15.56.1 | SUSE-SU-2023:4093-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.92.1 | SUSE-SU-2023:4072-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.92.1.150400.24.42.1 | SUSE-SU-2023:4072-1 |
| SLE Micro 5.3 | kernel-rt | 5.14.21-150400.15.56.1 | SUSE-SU-2023:4093-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.31.1 | SUSE-SU-2023:4071-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_0 +1 | 6-150500.15.1 | SUSE-SU-2023:4805-1, SUSE-SU-2023:4766-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_2 | 5-150500.2.1 | SUSE-SU-2023:4841-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_3 | 4-150500.2.1 | SUSE-SU-2023:4848-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_5 +1 | 3-150500.2.1 | SUSE-SU-2023:4863-1, SUSE-SU-2023:4775-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_6 +1 | 1-150500.11.3.1 | SUSE-SU-2023:4071-1, SUSE-SU-2023:4035-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.92.1 | SUSE-SU-2023:4072-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4-RT_Update_1 | 12-150400.2.2 | SUSE-SU-2023:4848-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4-RT_Update_14 | 1-150400.1.3.1 | SUSE-SU-2023:4093-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4-RT_Update_2 | 11-150400.2.2 | SUSE-SU-2023:4766-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_11 | 8-150400.2.1 | SUSE-SU-2023:4822-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_15 | 5-150400.2.1 | SUSE-SU-2023:4805-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_16 | 4-150400.2.1 | SUSE-SU-2023:4872-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_18 +1 | 3-150400.2.1 | SUSE-SU-2023:4801-1, SUSE-SU-2023:4775-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_19 | 1-150400.9.3.1 | SUSE-SU-2023:4072-1 |
| SUSE Real Time Module 15 SP5 | kernel-rt +3 | 5.14.21-150500.13.21.1 | SUSE-SU-2023:4035-1 |
| SUSE Real Time Module 15 SP4 | kernel-rt +3 | 5.14.21-150400.15.56.1 | SUSE-SU-2023:4093-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kernel-source | 6.5.6-1.1 | openSUSE-SU-2024:13704-1, openSUSE-SU-2024:13305-1 |
| openSUSE Leap 15.5 | dtb-aarch64 +10 | 5.14.21-150500.55.31.1 | SUSE-SU-2023:4071-1 |
| openSUSE Leap 15.5 | kernel-azure +2 | 5.14.21-150500.33.20.1 | SUSE-SU-2023:4058-1 |
| openSUSE Leap 15.5 | kernel-default-base | 5.14.21-150500.55.31.1.150500.6.13.1 | SUSE-SU-2023:4071-1 |
| openSUSE Leap 15.5 | kernel-rt +3 | 5.14.21-150500.13.21.1 | SUSE-SU-2023:4035-1 |
| openSUSE Leap 15.4 | dtb-aarch64 +10 | 5.14.21-150400.24.92.1 | SUSE-SU-2023:4072-2 |
| openSUSE Leap 15.4 | kernel-azure +2 | 5.14.21-150400.14.69.1 | SUSE-SU-2023:4057-1 |
| openSUSE Leap 15.4 | kernel-default-base | 5.14.21-150400.24.92.1.150400.24.42.1 | SUSE-SU-2023:4072-2 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.56-82.125 | 1.0-0.amzn2023 | ALAS2023-2023-385 |
| Amazon Linux 2023 | perf +13 | 6.1.56-82.125.amzn2023 | ALAS2023-2023-385 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | hyperv-daemons | 5.15.135.1-1 | — |
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.135.1-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | bpftool | 7.2.0-362.13.0.1.el9_3 | ELSA-2023-13047, ELSA-2023-7749 |
| Oracle Linux 9 | perf +23 | 5.14.0-362.13.0.1.el9_3 | ELSA-2023-13047, ELSA-2023-7749 |
Advisories 33
- USN-6520-1 linux-starfive-6.2 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-6502-3 linux-nvidia-6.2 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6502-1 linux, linux-aws, linux-aws-6.2, linux-hwe-6.2, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-6.2, linux-raspi, linux-starfive vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6502-4 linux-azure, linux-azure-6.2, linux-azure-fde-6.2, linux-gcp, linux-gcp-6.2 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6461-1 linux-oem-6.1 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6607-1 linux-azure, linux-azure-5.15, linux-azure-fde, linux-azure-fde-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- RHSA-2023:7749 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:7734 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- USN-6503-1 linux, linux-aws, linux-laptop, linux-lowlatency, linux-oem-6.5, linux-oracle, linux-raspi, linux-starfive vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- LSN-0100-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Jun 3, 2026
- ALAS2023-2023-385 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 8, 2026
- RXSA-2023:7749 Important: kernel security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2023:4872-1 Security update for the Linux Kernel (Live Patch 16 for SLE 15 SP4) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4035-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4805-1 Security update for the Linux Kernel (Live Patch 0 for SLE 15 SP5) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4072-2 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13704-1 kernel-devel-longterm-6.6.17-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4822-1 Security update for the Linux Kernel (Live Patch 11 for SLE 15 SP4) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4848-1 Security update for the Linux Kernel (Live Patch 3 for SLE 15 SP5) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4093-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4801-1 Security update for the Linux Kernel (Live Patch 18 for SLE 15 SP4) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4057-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4775-1 Security update for the Linux Kernel RT (Live Patch 5 for SLE 15 SP5) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4058-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4841-1 Security update for the Linux Kernel (Live Patch 2 for SLE 15 SP5) SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13305-1 kernel-devel-6.5.6-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4863-1 Security update for the Linux Kernel (Live Patch 5 for SLE 15 SP5) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4766-1 Security update for the Linux Kernel RT (Live Patch 0 for SLE 15 SP5) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4071-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4072-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-2549 Linux Kernel: Schwachstelle ermöglicht Privilegieneskalation BSI CERT-Bund (WID) · May 15, 2024
- ELSA-2023-7749 Important: kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Dec 22, 2023
- ELSA-2023-13047 Important: kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Dec 14, 2023
References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e6e43b8aa7cd3c3af686caf0c2e11819a886d705 patch
- https://kernel.dance/e6e43b8aa7cd3c3af686caf0c2e11819a886d705
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V5PDNWPKAP3WL5RQZ4RIDS6MG32OHH5R/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GISYSL3F6WIEVGHJGLC2MFNTUXHPTKQH/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GPMICQ2HVZO5UAM5KPXHAZKA2U3ZDOO6/
- http://packetstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.html